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Re: 5th col dies, cols 6 thru 15 move 1 col left, 15th col is born

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On 4/20/2013 12:02 PM, clusa@aol.com wrote:
>> On Saturday, April 20, 2013 11:17:52 AM UTC-4, Eric Sosman wrote:
>> JTable should be straightforward. You'd extend AbstractTableModel to handle
>> the "sliding," calling fireTableDataChanged() to update the display.
>> Conveniences like scrolling would come for free (almost), and the JTable's
>> display might well be more efficient than managing 4500 JLabels. No, I don't
>> have example code. -- Eric Sosman esosman@comcast-dot-net.invalid
>
> I would also be able to eloquently color specific cells.

     You can be as eloquent as you like with a TableCellRenderer,
most likely an extension of DefaultTableCellRenderer.  This time,
I've got some example code (not eloquent, and not colorized, but
it should demonstrate the approach):

/**
  * A {@code TableCellRenderer} that centers displayed text.
   */
class CenteredRenderer extends DefaultTableCellRenderer {

    private static CenteredRenderer instance;

    static CenteredRenderer instance() {
       if (instance == null) {
          instance = new CenteredRenderer();
       }
       return instance;
    }

    private CenteredRenderer() {
       assert SwingUtilities.isEventDispatchThread();
    }

    @Override
    public Component getTableCellRendererComponent(JTable table,
          Object value, boolean select, boolean focus, int row, int col) {
       assert SwingUtilities.isEventDispatchThread();
       Component comp = super.getTableCellRendererComponent(table,
             value, select, focus, row, col);
       if (comp instanceof JLabel) {
          ((JLabel) comp).setHorizontalAlignment(SwingConstants.CENTER);
       }
       return comp;
    }
}

I use it this way, in the constructor of a class extending
JTable:

TableColumnModel colmod = getColumnModel();
for (int c = 0; c < COLUMNS; ++c) {
    TableColumn col = colmod.getColumn(c);
    if ( /* I want this column centered ... */ ) {
       col.setCellRenderer(CenteredRenderer.instance());
    }
}

-- 
Eric Sosman
esosman@comcast-dot-net.invalid

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5th col dies, cols 6  thru 15 move 1 col left, 15th col is born clusardi2k@aol.com - 2013-04-19 16:54 -0700
  Re: 5th col dies, cols 6  thru 15 move 1 col left, 15th col is born Knute Johnson <nospam@knutejohnson.com> - 2013-04-19 17:03 -0700
    Re: 5th col dies, cols 6  thru 15 move 1 col left, 15th col is born "clusa@aol.com" <clusardi2k@aol.com> - 2013-04-19 17:29 -0700
    Re: 5th col dies, cols 6  thru 15 move 1 col left, 15th col is born "clusa@aol.com" <clusardi2k@aol.com> - 2013-04-19 22:29 -0700
      Re: 5th col dies, cols 6  thru 15 move 1 col left, 15th col is born Knute Johnson <nospam@knutejohnson.com> - 2013-04-20 09:02 -0700
  [OT] Re: 5th col dies, cols 6  thru 15 move 1 col left, 15th col is born Manuel Collado <m.collado@domain.invalid> - 2013-04-20 16:44 +0200
  Re: 5th col dies, cols 6  thru 15 move 1 col left, 15th col is born Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-04-20 11:17 -0400
    Re: 5th col dies, cols 6  thru 15 move 1 col left, 15th col is born "clusa@aol.com" <clusardi2k@aol.com> - 2013-04-20 09:02 -0700
      Re: 5th col dies, cols 6  thru 15 move 1 col left, 15th col is born Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-04-20 14:14 -0400

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